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| Titel |
The impact of nitrogen and phosphorous limitation on the estimated terrestrial carbon balance and warming of land use change over the last 156 yr |
| VerfasserIn |
Q. Zhang, A. J. Pitman, Y. P. Wang, Y. J. Dai, P. J. Lawrence |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2190-4979
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| Digitales Dokument |
URL |
| Erschienen |
In: Earth System Dynamics ; 4, no. 2 ; Nr. 4, no. 2 (2013-09-16), S.333-345 |
| Datensatznummer |
250084955
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| Publikation (Nr.) |
 copernicus.org/esd-4-333-2013.pdf |
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| Zusammenfassung |
| We examine the impact of land use and land cover change (LULCC) over the
period from 1850 to 2005 using an Earth system model that incorporates
nitrogen and phosphorous limitation on the terrestrial carbon cycle. We
compare the estimated CO2 emissions and warming from land use change in
a carbon-only version of the model with those from simulations, including
nitrogen and phosphorous limitation. If we omit nutrients, our results
suggest LULCC cools on the global average by about 0.1 °C. Including
nutrients reduces this cooling to ~ 0.05 °C. Our results
also suggest LULCC has a major impact on total land carbon over the period
1850–2005. In carbon-only simulations, the inclusion of LULCC decreases the
total additional land carbon stored in 2005 from around 210 Pg C to 85 Pg C.
Including nitrogen and phosphorous limitation also decreases the scale of
the terrestrial carbon sink to 80 Pg C. Shown as corresponding fluxes,
adding LULCC on top of the nutrient-limited simulations changes the sign of
the terrestrial carbon flux from a sink to a source (12 Pg C). The CO2
emission from LULCC from 1850 to 2005 is estimated to be 130 Pg C for carbon
only simulation, or 97 Pg C if nutrient limitation is accounted for in our
model. The difference between these two estimates of CO2 emissions from
LULCC largely results from the weaker response of photosynthesis to
increased CO2 and smaller carbon pool sizes, and therefore lower carbon
loss from plant and wood product carbon pools under nutrient limitation. We
suggest that nutrient limitation should be accounted for in simulating the
effects of LULCC on the past climate and on the past and future carbon
budget. |
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